JP2002166252A - Fermentative treatment method of hardly decomposable organic waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fermentative treatment method in which organic garbage is treated by fermentation by the use of a thermostable bacterium without the incinerating treatment of hardly decomposable organic garbage. SOLUTION: This method comprises a mixing process (S1) where a bacterial bed containing the bacterium previously propagated is mixed with the hardly decomposable organic garbage, an adjustment process (S2) of water content where the water content of the fermentative mixture of the bacterial bed and the hardly decomposable garbage is adjusted between 30% and 60%, and a first fermentation process (S3) where the fermentation is made to proceed under the state that there is piled up of the fermentative mixture which water content has been adjusted, and a treatment trough 3 in the shape of an upside down conic trapezoid which can made the fermentative mixture closed up tightly when the internal temperature thereof reaches 60 deg.C, and a secondary fermentation process (S4) where the fermentative mixture is accommodated in a fermentation treatment device 1 having a stirring means with plural number of stirring blades 21 crushing and mixing the content and plural number of such temperature detecting means 15 as arranged to leave a certain space, and where harmful microorganism such as pathological bacteria are sterilized by raising the temperature of the fermentative mixture to 80 deg.C or maintaining the similar condition effective for sterilization and then the fermentative mixture is eventually changed to a compost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fermentation treatment method for hard-to-decompose organic waste, and more particularly, to aerobic fermentation of hard-to-decompose organic waste such as paper, sawdust or biomass by microorganisms. The present invention relates to a method for treating persistent organic waste to be treated.

[0002]

2. Description of the Related Art Conventionally, garbage discharged from homes is classified into so-called "burnable garbage" such as leftovers, garbage and used paper diapers, and so-called "non-burnable garbage" such as plastics. Collected by a collection vehicle on the date and time of
"Burning garbage" has been incinerated, and "non-burnable garbage" has been landfilled. Paper such as cardboard, old newspapers and old magazines are recycled and used as recycled paper and cardboard. Recycling of paper waste by local governments is becoming more thorough due to increased awareness of environmental issues related to resources, and the amount of paper collected is increasing. However, in recent years, the use of paper such as copy paper has increased sharply, reflecting the recent shift to OA in business establishments, and the amount of newspapers, books, and magazines issued has been steadily increasing due to the development of mass media. In addition, with the development of logistics, the amount of cardboard used for packing luggage has been rapidly increasing. Under such circumstances, papers out of “burnable garbage” are 50 to 6
It is currently occupying 0%.

[0003] On the other hand, in business establishments that generate a large amount of garbage, such as lunch centers and restaurants, they are mainly processed as pig feed by specialized processing companies and pig farmers.
In recent years, decomposition treatment has been performed by the action of microorganisms using a fermentation treatment apparatus.

[0004]

However, as for the recycling of paper, the market for recycled paper has fallen sharply due to the increase in the amount of paper collected, and some paper manufacturers and intermediate wholesalers have reduced the amount of paper collected. Is coming. In addition, the removal of staples and the pre-processing of ink, glue, and the like, which are performed prior to the reproduction processing, require considerable labor. Therefore, recycled paper is more expensive than virgin paper, and the recycling rate is 50 to 60%, and the remainder is inevitably incinerated as "burnable garbage".

[0005] Regarding the incineration of garbage, in addition to securing land for the incineration plant and the cost of facilities and equipment, environmental pollution problems such as incineration ash treatment, foul odor and smoke around the incineration plant, and generation of dioxin are social problems. Is becoming For example, garbage and used disposable diapers contain a large amount of water and salt, which is a cause of dioxin generation. As described above, while the amount of waste to be incinerated is increasing, incineration involves various problems.

[0006] Paper used for cardboard, newspapers, magazines, and books is manufactured from pulp, and the pulp used as a raw material is an aggregate of cellulose fibers separated by subjecting a plant raw material to mechanical or chemical treatment. It is. Cellulose is a polysaccharide in which glucose is mainly a β-1,4 glucosidic bond, and can be decomposed by microorganisms. However, since it is a hardly decomposable organic substance that requires a long time for decomposition, there is a problem that if all the steps of the fermentation treatment are performed by the fermentation treatment apparatus, the treatment efficiency becomes extremely poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for efficiently fermenting hard-to-decompose organic wastes such as cardboard, old newspapers, old magazines, and old papers by using heat-resistant bacteria without incineration. An object of the present invention is to provide a fermentation treatment method for hardly decomposable organic waste to be treated. It is another object of the present invention to provide a fermentation treatment method for hardly decomposable organic waste, which can simultaneously perform fermentation treatment on easily decomposable organic waste such as garbage, garbage, and used disposable diapers.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that it is difficult to carry out aerobic fermentation of microorganisms to hardly decomposable organic wastes such as papers, sawdust or biomass by fermentation. A method for treating decomposable organic waste, comprising:
A mixing step of mixing a microorganism bed in which microorganisms have been propagated in advance with the hardly decomposable organic waste, and a water adjusting step of adjusting the water content of the fermentation mixture obtained by mixing the microorganism bed and the hardly decomposable organic waste to 30 to 60% And a primary fermentation step in which fermentation proceeds with the moisture-regulated fermentation mixture stacked up, and a substantially inverted cone for sealingly containing the fermentation mixture when the internal temperature of the fermentation mixture reaches at least 60 degrees Celsius. The fermentation mixture is accommodated in a fermentation treatment apparatus having a trapezoidal processing tank, a stirring means having a plurality of stirring blades for crushing and mixing the contents, and a plurality of temperature detecting means arranged at intervals. And a secondary fermentation step of killing harmful microorganisms such as pathogenic bacteria and composting by raising the temperature to 80 degrees Celsius or maintaining it under conditions having a bactericidal effect equivalent thereto. It provides a fermentation method of processing solutions organic waste. Here, the hardly decomposable organic waste includes biomass and the like in addition to sawdust, corrugated cardboard, old newspaper / magazine, old paper. Easily decomposable organic waste includes leftovers, garbage,
Livestock dung, used paper diapers, etc. are included. As the microorganism, various aerobic bacteria that require oxygen, filamentous fungi, heat-resistant bacteria such as actinomycetes, and the like are used. In the secondary fermentation,
Organic substances such as cellulose and lignin that cannot be completely decomposed in the primary fermentation are mainly decomposed.

According to a second aspect of the present invention, there is provided a fermentation treatment method for a hardly decomposable organic waste according to the first aspect, wherein the bacterial bed comprises a fermentation mixture in which fermentation in the primary fermentation step is started. Alternatively, it is a compost obtained through a secondary fermentation step.

[0010] In order to solve the above-mentioned problem, the invention according to claim 3 provides a method for fermenting a hardly decomposable organic waste according to claim 1 or 2, wherein the fermentation in the primary fermentation step is in progress. The method is characterized in that fresh persistent organic waste is added to the mixture and the total water content is adjusted to 30 to 60% to further continue the primary fermentation.

According to a fourth aspect of the present invention, there is provided a method for fermenting a hardly decomposable organic waste according to any one of the first to third aspects. It is also characterized by mixing easily decomposable organic waste such as leftovers, garbage, used paper diapers and the like discharged from homes or lunch centers, restaurants, etc., and simultaneously fermenting the easily decomposable organic waste. I do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the method for fermenting organic waste according to the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing one embodiment of the method for treating hardly decomposable organic waste according to the present invention. at first,
Refractory organic waste to be treated, such as sawdust, cardboard, old newspapers, old magazines, old paper, and biomass, is separated from non-combustible garbage such as plastic and raw garbage at home and offices, and collected. It is collected at a predetermined date and time by a car or the like and transported to a processing plant. Here, cardboard
Paper used for newspapers, magazines, and books is manufactured from pulp, and the pulp as a raw material is an aggregate of cellulose fibers separated by mechanically or chemically treating a plant raw material. This cellulose is mainly a polysaccharide in which glucose is linked to β-1,4 glucoside and can be decomposed by microorganisms, but it takes a long time of several months for decomposition. In addition, the intermediate layer of woody plants such as biomass and sawdust is composed of components such as cellulose, hemicellulose, and lignin, and these also require a long period of time for decomposition by microorganisms.

Next, the hardly decomposable organic wastes such as cardboard, old newspapers, old magazines and the like carried to the treatment plant are finely crushed.
The crushing is performed, for example, using a crusher 31 as shown in FIG. This crushing machine 31 is roughly composed of an inlet 33 for introducing organic waste into the crushing machine 31, an upper crushing section 31a and a lower crushing section 31b, and a carrier 35 with casters 35a. . Each of the upper crushing part 31a and the lower crushing part 31b has two rotors 3
4 and 34 and the cutter 32. The rotors 34, 34 have a shape in which a convex portion and a concave portion are repeatedly continuous, and the two rotors 34, 34 are arranged so as to be orthogonal to each other, and are mutually rotated inward by a motor (not shown). ing. Further, a cutter 32 having a plurality of thin plate-shaped blades provided in parallel with the rotors 34, 34 is provided at a lower portion thereof so as to be rotatable by a motor (not shown). Inlet 3 of crusher 31
The organic waste input from 3 is supplied to two rotors 34, 34
While being crushed by the rotation of, it is sent to the cutter 32 arranged on the lower side and further cut into smaller pieces. Then, the crushed organic waste is carried to the next step by the carrier 35. Of course, this crusher 31 is an example, and FIG.
However, the present invention is not limited to the configuration shown in FIG.

Then, the crushed hard-to-decompose organic waste is mixed at a ratio of 1 to 10 times the amount 1 of the bacterial bed on which the heat-resistant bacteria are growing (step 1). The bacterial bed is, for example,
A fermentation promoter seeded with microorganisms in advance or a compost obtained by fermenting a readily decomposable organic waste such as residual rice or garbage with microorganisms is used. Since a large amount of microorganisms are breeding in such compost, the microorganisms are activated again by mixing with the hardly decomposable organic waste, and decomposition is started. It should be noted that garbage and garbage are mainly composed of proteins and carbohydrates and can be decomposed by microorganisms in a relatively short time. As the microorganism, various aerobic bacteria, filamentous fungi, actinomycetes and other heat-resistant bacteria that require oxygen are mainly used. This thermostable bacterium is characterized in that the respiratory action is biologically the most energy efficient and the growth rate is higher than that of the anaerobic bacterium.

The mixing of the bacterial bed with the hard-to-decompose organic waste involves spreading the crushed hard-to-decompose organic waste on a fungus bed laid on the floor, and then using a roller, a skid steer loader,
Mixing is performed using a small shovel loader or the like. That is, using a skid steer loader, a small shovel loader, or the like, the crushed hardly decomposable organic waste is mixed with the bacterial bed so as to be in sufficient contact. The mixing of the organic waste to be treated and the bacteria bed may be performed on the ground, but is preferably performed on a floor that is shielded from the ground by concrete or an iron plate as much as possible. Regarding the crushing of the hard-to-decompose organic waste, a skid steer loader and a small-sized Crushing and mixing may be performed while crushing with a shovel loader or the like.

Next, the water content of the fermented mixture in which the bacterial bed and the hardly decomposable organic waste are mixed is adjusted (step S2). When the hardly decomposable organic waste is paper such as cardboard, old newspaper, old magazine, old paper, etc., its water content is usually 5 to 15%.
Therefore, the moisture content of the whole fermented mixture after mixing the hardly decomposable organic waste may be as low as 20% or less. In this case, since fermentation does not proceed smoothly, water is adjusted by applying water to the piled fermentation mixture with a hose or the like so that the water content of the fermentation mixture becomes 30 to 60% so that the fermentation proceeds smoothly. Perform

On the other hand, hardly decomposable organic wastes such as corrugated cardboard, old newspapers, old magazines, old papers, etc. are exposed to rainwater or contain a large amount of water due to water wetting, etc., and the water content of the fermentation mixture exceeds 60%. In such a case, the water content is adjusted by adding hardly decomposable organic waste such as dry cardboard having a low water content, old newspapers, old magazines, and old papers. Of course, the water content may be adjusted to 30 to 60% by draining or drying.

This moisture adjusting step (S2) can be performed before the mixing step (S1) of the bacterial bed and the hardly decomposable organic waste. That is, the water content of the hardly decomposable organic waste to be treated is as low as about 20% or less.
In the case of paper such as waste paper, a suitable amount of water is applied before crushing to adjust the water content in advance. According to this method, the paper-based organic waste absorbs water and becomes soft as a whole, so that there is an advantage that the treatment in the subsequent crushing step becomes easy and the adhesion of the bacterial bed is also improved.

Next, the fermentation mixture in which the bacterial bed and the hardly decomposable organic waste are mixed is piled up at one place, and the primary fermentation proceeds (step S3). In this case, the heat generated by the progress of fermentation further promotes fermentation decomposition and has the effect of suppressing the activity of anaerobic bacteria and pathogenic bacteria. Therefore, it is desired that the entirety be maintained at a high temperature as much as possible. Therefore, the fermentation mixture is preferably piled up so as to have a small surface area. In the primary fermentation, on the first day of mixing the bacterial bed and the persistent organic waste, the internal temperature becomes about 42 degrees Celsius,
After a few days, steam will rise from the fermentation mixture.
Then, about 1 to 2 weeks after mixing, the internal temperature of the fermented mixture reaches 60 to 70 degrees Celsius or more.

[0020] A new hardly decomposable organic waste can be added to the fermentation mixture in which the fermentation in the primary fermentation step is in progress to further continue the primary fermentation. In other words, the fermentation mixture in which primary fermentation is progressing can be regarded as a bacterial bed itself. The fermentation continues. In this case, it is advisable to mix the fermentation mixture in which the heat-resistant bacteria are propagated at a ratio of 1 to 10 times the amount 1 of the fermentation mixture. Further, it is preferable to adjust the water content of the whole fermentation mixture after mixing the new hard-to-decompose organic waste to 30 to 60% in order to make the fermentation proceed smoothly. The addition of the new hardly decomposable organic waste during the primary fermentation step can be repeated many times.

Then, when the internal temperature of the fermented mixture in which the primary fermentation is progressing in the stacked state reaches at least 60 degrees Celsius, the fermented mixture is accommodated in a fermentation treatment apparatus and further subjected to secondary fermentation (step). S4). That is, the fermentation mixture in which the primary fermentation has progressed and the whole volume has been reduced is subjected to secondary fermentation in the treatment tank to be composted.
In this way, the primary fermentation proceeds, the temperature of the fermentation mixture rises, and the fermentation mixture in a state in which the total amount is reduced is treated by the fermentation treatment device, so that the hard-to-decompose organic waste is directly input to the fermentation treatment device. As a result, it becomes possible to treat a large amount of the hardly decomposable organic waste as compared with the case where the waste is treated.

In the secondary fermentation performed using the fermentation treatment device,
The fermentation proceeds until the temperature of the fermentation mixture reaches 80 degrees Celsius. That is, harmful microorganisms such as pathogenic bacteria are sterilized by reaching a temperature of 80 degrees Celsius. However, the temperature condition is not limited to this, and the temperature may be maintained at a condition where an effect equal to or higher than that is exerted, for example, at 75 degrees Celsius for 30 minutes. In this way, if the fermented mixture after the primary fermentation is processed by the fermentation treatment device, the whole fermented mixture can be easily heated until it reaches a predetermined sterilization temperature, which is an effective countermeasure against harmful microorganisms. If the fermented mixture after the primary fermentation cannot be put into the fermentation treatment apparatus at one time, it is put in several times. That is, the fermentation mixture after the primary fermentation is put into the fermentation treatment device in an amount that can be accommodated in the fermentation treatment device, and when the internal temperature reaches 80 degrees Celsius, the fermentation mixture is taken out and the next fermentation mixture is put in.
And this is sequentially repeated. In this case, it takes time until the temperature rises because the entire fermentation processing apparatus is cold at the time of the first charging, but the temperature rises in a relatively short time since the fermentation processing apparatus itself is warmed after the second time. . Therefore, the secondary fermentation treatment can be performed in a short time.

As an example of the fermentation treatment device used in the secondary fermentation step (S4), there is a fermentation treatment device 1 as shown in FIG. That is, the fermentation treatment apparatus 1 is made of aluminum, aluminum alloy, steel, or the like, and has a height of 10 mm.
Treatment tank 3 formed into a hollow substantially inverted truncated cone of 0 cm or less
Are supported and mounted on a gantry 4 including a plurality of supports. The processing tank 3 is formed in a substantially inverted truncated conical shape having an inclination of 20 to 50 degrees with respect to a vertical direction that accommodates the processed material in a sealable manner, and has a cylindrical enlarged diameter portion 5 located above, and this enlarged diameter. And a substantially inverted truncated conical reduced diameter portion 6 integrally and continuously located below the portion 5.

At the center of a flat upper portion of the processing tank 3, a shaft support 7 for a rotating shaft is formed so as to protrude. The shaft support 7 has a built-in bearing. At locations deviated radially outward from the center of the upper part, an inlet 9 for organic waste, which is opened and closed by a lid 8, a viewing window 10 for internal observation, a mounting nozzle 11 for a thermometer, a lighting nozzle (not shown), A panel 12 and an exhaust duct 13 for discharging carbon dioxide gas, water vapor and the like in the processing tank 3 to the outside are provided respectively. IC provided on control panel 12
A control means such as a chip controls the motor 17 and the screw conveyor 14 and the like. At the lower part of the peripheral wall of the processing tank 3, a screw conveyor 14 as a discharge port is horizontally and integrally installed, and the screw conveyor 14 discharges the processed fermentation mixture to the outside.

A plurality of temperature sensors 15 such as a thermistor are installed on the inner peripheral wall of the processing tank 3, and the plurality of temperature sensors 15 are arranged in the vertical direction (vertical direction) of the processing tank 3.
The plurality of temperature sensors 15 function to output detection signals to the control panel 12 at predetermined intervals. Further, a heat insulating material 16 made of asbestos, glass wool, or the like is integrally covered on the outer peripheral wall of the processing tank 3, and the heat insulating material 16 effectively suppresses transfer of fermentation heat from the processing tank 3 to the outside. I do.

The motor 17 is an inexpensive general-purpose AC motor or D
A C motor or the like is mounted on the gantry 4 and rotates at a rotation speed of, for example, about 110 / min to sufficiently mix the organic waste 2. A reduction gear 18 is connected to the motor 17, and an output shaft of the reduction gear 18 is located at the lower center of the processing tank 3. The rotating shaft 19 has an upper end supported by a bearing of the shaft support 7, a lower end supported by a bearing at a lower portion of the processing tank 3, and a joint 20 connected to an output shaft of the reduction gear 18.
And via a sealing device. A plurality of stirring blades 21 radially directed to the processing tank 3 are radially mounted on and supported by the rotating shaft 19 via fasteners, and the fermentation mixture is crushed and mixed by the metal stirring blades 21. . Of course, this fermentation processing apparatus 1 is only an example, and can be realized by another fermentation processing apparatus. Then, when the temperature of the fermentation mixture reaches 80 degrees Celsius, the fermentation mixture is sequentially taken out and the secondary fermentation is terminated. The fermented mixture taken out can be used as compost as it is or after further natural fermentation.

On the other hand, in the secondary fermentation step (S4), organic waste which is relatively easily decomposed can be added and treated at the same time. That is, the fermentation mixture in which the primary fermentation has progressed has microorganisms proliferating therein, and can be regarded as a kind of bacterial bed. Therefore, at the stage of performing the secondary fermentation (S4), fermentation is performed by adding easily decomposable organic wastes such as new garbage, garbage, and used disposable diapers, and thereby the hardly decomposable organic waste and the easily decomposable organic waste are added. Can be simultaneously fermented. That is, it is possible to eliminate the time difference in the time required for the fermentation treatment between the hardly decomposable organic waste and the easily decomposable organic waste.

[0028]

[Examples] Among the resource waste collected at the Nago Environmental Beautification Center in Okinawa Prefecture, fermentation treatment was performed on paper waste, which is a hardly decomposable organic waste that is difficult to reuse. First, old newspapers from the Nago Environmental Beautification Center,
Wastes, mainly old magazines and waste cardboard, were brought in at about 14:00 to 15:00, three times a week on Tuesday, Wednesday and Thursday, and subjected to fermentation treatment. However, the day of delivery may differ depending on the circumstances. Table 1 shows the delivery date and amount.

[0029]

[Table 1]

As shown in Table 1, one week of the above-mentioned paper waste was added to about 1 ton of a bacterial bed made mainly of fermented cardboard prepared on Tuesday, August 29, 2000. , 5
40 kg was added and stirred and mixed with a skid steer loader. Since the water content of the fermentation mixture at this time was about 10%, water was sprinkled with a hose to adjust the water content to about 35%. The time required for this operation is about one hour. The next day (8/3
In 0), 1,500 kg of waste was carried in, and the mixture was stirred and mixed in addition to the fermentation mixture during the primary fermentation. The next day (8/31), 2,530 kg of waste was carried in and the same operation was performed. The next day, no waste was carried in, but when the fermentation mixture was turned upside down, steam was found to rise.

Next week 9/5 (Tue), 9/6 (Wed), 9/7
(Thursday) wastes are brought in at 3,170k each
g, 3,820 kg, and 2,440 kg were added to the fermentation mixture during the primary fermentation, followed by stirring and mixing. The time required for the work was about 2 hours. The fermentation mixture was turned upside down on days when no waste was brought in. 9/12
No.13 is 57 due to typhoon and no waste was delivered.
0 kg was carried in and the same processing was performed. In this way, 4,920 kg on 9/19 and 2,65 kg on 9/20
0kg, 3 / 470kg on 9/21, 3,4 on 9/26
70kg, 2 / 040kg on 9/27, 2/9/28
360kg, 10/3 3,230kg, 10/4 1,660kg, 10/6 1,590kg, 10/1
0, 3,710 kg, 10/11, 3,090 kg, 1
On 0/12, a total of 50,330 kg of 2,570 kg was subjected to the primary fermentation.

[0032] It was found that the fermentation mixture turned brown and fermentation proceeded one to two weeks after the start of the fermentation treatment while maintaining the predetermined water content. Also, the fermented mixture became softer as the fermentation progressed, and the corrosion proceeded to increase the ragged portions. The smell was a little smelling of alcohol but with a fermentation sensation. Temperature is 1 ~
50 degrees Celsius over two weeks, 70 degrees Celsius in some places
Degrees had been reached. The temperature was not uniform due to the mixing of the new waste, but varied depending on the measurement site. Steam was confirmed on the fourth day from the start of fermentation, and it was confirmed that the steam had risen from a depth of about 1 m piled up.
Here, the temperature transition of the fermentation mixture from 9/10 to 9/11 and 9/16 to 17 is shown in FIG. The temperature at the start of the measurement is low because the fermentation mixture was so-called turned upside down for stirring and mixing. 9 / 10-9 / 11
Although the temperature rise is unstable due to the outside temperature,
From 9/16 to 17 when the fermentation progressed, the temperature was surely increased without being affected by the outside air temperature, and it can be seen that the internal temperature of the fermented mixture exceeded 70 degrees by maintaining the fermentation mixture in a piled state.

Next, about 170 kg of the fermented mixture in which the primary fermentation had progressed was put into the fermentation treatment device 1 and stirred, and then the secondary fermentation was carried out by the fermentation treatment device. Then, as shown in FIG. 5, it was confirmed that the internal temperature of the fermentation treatment device 1 exceeded 80 degrees Celsius in about one hour. here,
1,671 Kg of the fermented mixture after the primary fermentation described above is divided into ten batches and fed into the fermentation treatment apparatus 1 for secondary fermentation. When the internal temperature reaches 80 degrees Celsius, the fermented mixture is taken out and re-fermented again. The mixture was charged and the process was repeated sequentially. Table 2 shows the relationship between the temperature and the time at this time, and FIG. 6 shows a graph of this relationship.

[0034]

[Table 2]

According to Table 2, it takes 48 minutes for the fermented mixture to reach 80 degrees Celsius at the first feeding, but it is 2 minutes.
From the third time onward, the time required for the fermented mixture to reach 80 degrees Celsius is a minimum of 30 minutes, indicating that the treatment efficiency has increased.

[0036]

As described above, according to the method for fermenting hardly decomposable organic waste according to the present invention, the hardly decomposable organic waste such as cardboard, old newspaper, old magazine, old paper, etc. is incinerated. In addition, it is possible to perform fermentation treatment using microorganisms, and it is possible to efficiently perform fermentation treatment even for hardly decomposable organic waste that requires a long time for decomposition. In addition, easily decomposable organic wastes such as leftovers, garbage, and used paper diapers can be simultaneously treated with the hardly decomposable organic wastes without the time difference of the fermentation treatment time.

[Brief description of the drawings]

FIG. 1 is a flowchart of a method for treating organic waste according to the present invention.

FIG. 2 is a cross-sectional view illustrating the inside of an embodiment of a crusher used in the method for treating organic waste according to the present invention.

FIG. 3 is an explanatory cross-sectional view showing one embodiment of a fermentation treatment apparatus used in the method for treating organic waste according to the present invention.

FIG. 4 is a graph showing a temperature change of a fermentation mixture in a primary fermentation.

FIG. 5 is a graph showing a temperature change of a fermentation mixture in a secondary fermentation.

FIG. 6 is a graph showing the transition of the temperature in the fermentation treatment device when the fermentation mixture after the primary fermentation is repeatedly charged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fermentation processing apparatus 3 Processing tank 4 Stand 5 Large diameter part 6 Reduced diameter part 7 Shaft support part 8 Lid 9 Input port 10 Viewing window 11 Mounting nozzle 12 Control panel 13 Exhaust duct 14 Screw conveyor 15 Temperature sensor 16 Insulation material 17 Motor 18 Deceleration Machine 19 Rotary shaft 20 Joint 21 Stirrer blade 31 Crusher 31b Lower crusher 31a Upper crusher 33 Inlet 34 Rotor 35 Carrier

Continued on front page F-term (reference) 4D004 AA02 AA03 AA12 AC05 BA04 CA04 CA15 CA17 CA22 CB02 CB13 CB28 CC08 DA01 DA02 DA06 4H061 AA02 CC41 CC47 EE66 GG13 GG41 GG43 GG48 GG49 GG68 GG70 LL02 LL26

Claims (4)

[Claims] 1. A method for treating hard-to-decomposable organic waste, wherein the hard-to-decomposable organic waste, such as paper, sawdust or biomass, is aerobically fermented by a microorganism and fermented. A mixing step of mixing a bacterial bed in which microorganisms have been propagated in advance; a moisture adjusting step of adjusting the moisture content of a fermentation mixture obtained by mixing the bacterial bed and the hardly decomposable organic waste to 30 to 60%; A primary fermentation step in which fermentation proceeds in a state in which the fermented mixture is piled up, and in a substantially inverted truncated cone shape in which the fermented mixture is hermetically sealed when the internal temperature of the fermented mixture is at least 60 degrees Celsius. The fermentation mixture is accommodated in a fermentation treatment apparatus provided with a formed treatment tank, a stirring means having a plurality of stirring blades for crushing and mixing the contents, and a plurality of temperature detecting means arranged at intervals. A secondary fermentation step in which the temperature is raised to 80 degrees Celsius or maintained under conditions having a bactericidal effect equivalent thereto to kill harmful microorganisms such as pathogenic bacteria and to make compost, and a secondary fermentation process comprising: Fermentation treatment method. 2. The fermentation treatment method for a hardly decomposable organic waste according to claim 1, wherein the bacterial bed is obtained through the fermentation mixture that has started fermentation in the primary fermentation step or the secondary fermentation step. A fermentation treatment method for hardly decomposable organic waste, characterized by being compost. 3. The fermentation treatment method for hardly decomposable organic waste according to claim 1 or 2, wherein a new hardly decomposable organic waste is added to the fermentation mixture in which fermentation in the primary fermentation step is in progress. A method for fermenting hard-to-decompose organic waste, comprising adjusting the total water content to 30 to 60% and continuing the primary fermentation. 4. The fermentation treatment method for hardly decomposable organic waste according to any one of claims 1 to 3, wherein the fermentation mixture is discharged from a home or a catering center, a restaurant, or the like in the secondary fermentation step. A method of fermenting a hardly decomposable organic waste, comprising mixing the easily decomposable organic waste such as garbage, garbage and used paper diapers with the easily decomposable organic waste. .